JPH1137525A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner which is provided in a clean room of such industries as semiconductors, liquid crystal, food, and medicament industrie, and which has excellent constructional properties with power saving, low noise, slender from, and light weight. SOLUTION: In this air cleaner, the part of a baffle plate 9, which is provided in the downstream side of a centrifugal fan 3, is provided with on or more notches, in which a tongue 7 that stops the whirling flow from the fan 3 is disposed. The whirling flow from the fan 3 is turned to the direction of a filter 10 smoothly by the action of this tongue 7 and the notch part of the baffle plate 9, so that pressure is recovered, and that the high efficiency of the fan is realized. Moreover, the power saving, slender form, and low noise of the fan and the air cleaner are realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier for purifying air, for example, an air purifier expected to be installed in a clean room for manufacturing semiconductors and liquid crystals, a clean bench, a hospital room, and recently also in a general house. The present invention relates to an air purifying device for use.

[0002]

2. Description of the Related Art As a conventional air purifying apparatus for air purifying, a centrifugal motor connected to a motor shaft is provided in a rectangular container as shown in Japanese Patent Application Laid-Open No. 8-309129. The mainstream is a type of fan with a filter arranged downstream of it, the air is sucked in from the suction pipe by the rotation of the fan, the pressure is increased by the fan, and the increased swirling flow from the fan is applied to the container. It had a structure in which the direction of flow was changed on the inner surface, and a clean air was sent into a clean room through a filter arranged almost perpendicular to the rotation axis of the fan.

[0003] At this time, due to the characteristics of the centrifugal fan placed in the container, the flow is deviated in the circumferential direction of the fan and more outward than the center of the air purifier, so that the wind speed distribution at the filter outlet is not uniform, For this reason, an outer baffle plate for improving wind speed distribution may be attached relatively outside the container. In addition, a support member for supporting the motor was installed between the fan and the filter.

[0004]

In a large-scale clean room or the like, thousands of air cleaning devices are required. In that case, it is an air purifier for air purification that consumes several tens of watts per unit, but the annual power consumption reaches 600,000 Kwh, and the heat also becomes a load on the air conditioner of the clean room, Since an air conditioning load electric power equivalent to the above power cost is required, it is urgently necessary to reduce the power consumption of an air purifying device for air cleaning. In addition, since ceiling-installed type air purifiers have been used in ordinary houses, it is necessary to save power similarly.

[0005] Further, since the air purifying device is provided on the ceiling portion, maintenance is performed from behind the ceiling in order to reduce building construction costs, so that the device is lightweight, thin and high-strength. Is required.

[0006] The present invention relates to a power saving, thin type air purifying apparatus.
The purpose is to reduce noise.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a container for changing a swirling flow of air flowing out of a centrifugal fan in a centrifugal direction into a direction parallel to the axis of a fan shaft of the centrifugal fan. The air purifying apparatus is provided with a tongue member provided from the inner surface side of the container toward the outer peripheral direction of the fan so as to stop the swirling flow flowing in the centrifugal direction of the centrifugal fan. You.

A further object is to provide a container for changing the swirling flow of air flowing out of the centrifugal fan in the centrifugal direction to a direction parallel to the axis of the fan shaft of the centrifugal fan, and a filter for purifying air downstream of the container. In the arranged air purifier,
A tongue member provided to stop the swirling flow flowing in the centrifugal direction of the centrifugal fan, a centrifugal fan, a motor driving the centrifugal fan, and a motor supporting structure member assembled with an air intake member are provided in a container. This is also achieved by adopting a configuration in which it is incorporated.

[0009]

FIG. 1 shows an embodiment of the present invention. Arrows indicate air flow. In the container 1, a suction pipe 2, which is an air intake, a centrifugal fan 3, a motor 5 for driving the same, baffle plates 9 provided on both outer sides of the container 1 for uniformizing the wind speed distribution, and a motor are supported. And a filter 10 for purifying air downstream of the motor support member 6 to form a fan / air cleaning device. The basic tongue member 7 of the present invention is the centrifugal fan 3.
In the circumferential direction (centrifugal direction) of the container 1
Alternatively, it is provided on a part of the motor support member 6. The tongue member 7 is attached or integrally formed.

FIG. 2 is a sectional view taken along the line aa of the embodiment. In this example, two tongue members 7 are provided in the circumferential direction of the container 1. Arrows indicate air flow.
The flow of the air sucked in from the suction pipe 2 is boosted by the centrifugal fan 3, and the centrifugal fan 3 has a swirl component and the airflow flows relatively unevenly inside the container 1. The air flow deflected with this swirling component is blocked by the tongue member 7. The swirling flow blocked by the tongue member 7 is applied to the centrifugal fan 3 as shown in FIG.
And a part of the flow flowing out between the tongue member 7 and the baffle plate 9.

As a result, a relatively uniform space is provided between the baffle plates 9 provided on both outer sides of the container 1 provided for equalizing the wind speed distribution of the air blown out of the entire filter 10. As a result, the filter 10 is homogenized from the entirety of the filter 10 mounted downstream and blown out into the clean room (outside the air cleaning device).

When the tongue member 7 is not provided, the swirling flow of air is swirled in the container and causes a large loss. On the other hand, the tongue member 7 turns the flow direction so as to block the flow. A part of the dynamic pressure can be recovered by pressure, thereby increasing the fan static pressure rise value, and the fan theoretical pressure rise value hardly changes, which leads to an increase in fan efficiency.

The tongue member 7 may be attached singly or plurally to a portion of the container 1 where the effect is large. Also, the tongue member 7
The tip of the tongue 8 is provided with a tongue tip 8 having a curved bent portion so that the collision loss of the swirling flow from the centrifugal fan 3 does not increase and the fan noise does not increase. effective. Instead of bending, the tip may be fitted with a curved part.

The distance between the tip 8 of the tongue and the outer diameter of the fan is determined by the distance between the tip 8 of the tongue and the generation of the fan sound peculiar to the fan. It is important to attach to the position and shape that maximizes

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention. Arrows indicate air flow. A member 6 supporting a motor is composed of a filter 10 and a container 1 opposed thereto.
It is installed between the inner surface of the. The tongue member 7 is installed between the motor support member 6 and the inner surface of the container 1 facing the filter and extends from the inner surface of the container 1 facing the outer periphery of the centrifugal fan 3 toward the circumferential direction of the fan. Have been.

The tongue member 7 has a function of restoring the swirling flow from the fan to a static pressure, and has an effect of cooperating with the motor support member 6 to equalize the wind speed distribution downstream of the filter. Even when the worker walks on the upper surface of the container 1, there is an effect that the deformation of the container can be prevented by the motor support member 6 and the tongue member 7. In addition, by setting the area, shape, and the like of the motor support member 6 optimally, uniformization of the wind speed distribution downstream of the filter can be accurately adjusted.

FIG. 4 is a sectional view taken along the line aa in FIG. Although the flow of the air is not shown, it has a similar tendency to that of FIG. The baffle plate 9 has a rectangular shape in the figure, but may have an arbitrary shape for improving the wind speed distribution. Further, if the tip of the tongue member 7 is a rounded tongue tip 8, there is also an effect of preventing generation of abnormal noise called blade sound which is a problem in the centrifugal fan.

Another embodiment of the present invention will be described with reference to FIGS. Although the flow of the air is not shown, the tendency is substantially the same as in FIGS. FIG. 5 is a longitudinal sectional view,
FIG. 6 is a front view taken along the line aa in FIG. 5. The tongue member 7 is provided between the motor support member 6 and the inner surface of the container 1 facing the filter 10, and the effect is the same as in the above-described embodiment. It is characterized in that the motor support member 6 is larger than the outer diameter of the centrifugal fan 3 and covers the fan outer periphery when viewed from the filter 10 side. When the width of the motor support member 6 disposed downstream of the centrifugal fan 3 is larger than the outer diameter of the centrifugal fan 3, the flow from the centrifugal fan 3 becomes gentle between the motor support member 6 and the inner surface of the container 1. The static pressure increases in conjunction with the effect of the static pressure recovery of the swirling flow of the tongue member 7, and the fan efficiency is improved.

Another embodiment of the present invention will be described with reference to FIGS. Although the flow of the air is not shown, the tendency is substantially the same as in FIGS. FIG. 7 is a longitudinal sectional view,
FIG. 8 is a view as viewed in the direction of arrow aa in FIG. The components are the same as those of the above embodiment, except that the tongue member 7 of the motor support member 6 is attached, and the surface of the centrifugal fan 3 against which the swirling flow collides partially forms a notch. That is being done.

In this case, the effect of the tongue member 7 for stopping the swirling flow of the fan is substantially the same. However, after the swirling flow collides with the tongue member 7, the flow smoothly moves through the cut-out portion of the filter 10. Since the direction and the air resistance flowing between the filter 10 and the motor support member 6 are reduced, and the air is blown out relatively uniformly from the entire filter 10, the effect of increasing the total air volume is obtained. is there.

FIG. 9 schematically shows the flow around the tongue member 7. Due to the rotation of the centrifugal fan 3, when there is no tongue member 7, the flow from the centrifugal fan 3 flows while turning from the bottom to the top in the drawing, and leaks from between the outer periphery of the fan and the inner surface of the container as shown by the broken line. While most of the dynamic pressure is lost, the flow is blocked by the presence of the tongue member 7, and the fluid smoothly flows from the cutout portion of the motor support member in the filter direction and between the motor support member 6 and the filter 10. , Which leads to an increase in the air volume of the air cleaning device.

FIG. 10 shows the air volume / pressure / efficiency characteristics of the fan with and without the tongue member 7 in the embodiment shown in FIGS. The clearance between the tongue member 7 and the outer periphery of the centrifugal fan 3 is 2.5% of the fan outer diameter, and the tongue tip has a tongue tip 8 having a curvature.
Have. The horizontal axis is the same as the air flow with respect to the design air flow without the tongue member 7, and the pressure on the vertical axis is the same. If the tongue member 7 is installed, as compared with the conventional art in which the tongue member 7 is not provided, the pressure is significantly increased below the design airflow point, and the efficiency is also improved in the small airflow region.

Although the conventional design airflow point has a power saving effect of about 9%, the effect of this tongue member is a recent high external static pressure, that is, an effect in a field where a high static pressure is required outside the clean room. It turns out that it is the largest.

FIGS. 11 and 1 show another embodiment of the present invention.
2 will be described. FIG. 11 is a longitudinal cross-sectional view, and FIG. 12 is a view taken along a line aa in FIG. In the present embodiment, the motor support member 6 of the above embodiment is divided into the motor support member 6 and a baffle plate. When this method is adopted, the motor support member 6 can be made smaller, the baffle plate can be formed into an arbitrary shape, the wind speed distribution can be improved, and the structural strength of the entire air cleaning device can be improved.

FIG. 13 shows another embodiment. The tongue member 6 can be formed in the container when the motor support member 6 is bent in advance. Although the performance is the same as that of the above-described embodiment, there is an effect that the effect of reducing the number of parts can be exerted and the strength of the container can be improved. FIG.
In No. 3, the motor support member 6 and the baffle plate 11 for improving the fan static pressure are integrated, but the effect is the same even if they are separate bodies, and the planar shape thereof can easily adopt an arbitrary shape for improving the wind speed distribution.

FIG. 14 shows another embodiment of the present invention.
FIG. 15 is a view taken in the direction of arrow bb in FIG. In this embodiment,
A feature is that a guide 12 is provided on the windward side of the tongue member 6 so that the swirling flow of the fan does not collide at a right angle to the tongue member.
By doing so, there is an advantage that the collision loss can be minimized and the air volume of the air cleaning device can be improved. In other words, the tongue member is installed at two places in the circumferential direction of the fan, but a single or a plurality of tongue members may be installed at a position where the effect is obtained.

FIG. 16 shows another embodiment of the present embodiment. The tongue tip 8 is characterized in that it is installed inclined with respect to the blades 4 of the centrifugal fan 3. When the tip of the tongue is tilted, there is a great effect on suppression of generation of abnormal noise called blade sound which is a problem in the centrifugal fan. Although the tongue tip 8 is higher on the filter side in the figure, the reverse may be possible depending on the difference in the overall structure of the air purifier.

FIGS. 17 and 1 show another embodiment of the present invention.
8 will be described. FIG. 17 is a longitudinal sectional view, and FIG. 18 is a view taken along the line aa in FIG. A structural member having a motor 5 for driving the centrifugal fan 3 and a tongue member 7 for stopping the swirling flow from the fan attached to a part of a drive system 13 that also supports a suction pipe is assembled in advance into a container. It is inserted into the container 1 from above and installed.

If such a structure is adopted, even if an operator walks on the upper part of the container during maintenance, the centrifugal fan 3 and the suction pipe 2 are deformed in the same body (they are not relatively deformed). Because it can be made smaller, leakage from the gap can be made smaller and the air volume can be improved, and if the user only changes this part when the specification is changed, the specification can be changed, and the strength of the container is improved. . In FIG. 18 described above, the planar shape of the drive system unit 13 is rectangular, but may be another shape. Container 1
When a gap is formed between the drive system unit 13 and the inner surface of the container when the drive system unit 13 is inserted therein, the auxiliary member 14 is installed so as to be continuous between the end of the tongue member 7 and the inner surface of the container to reduce the air volume. And an increase in noise can be prevented.

[0030]

The swirling flow from the fan is smoothly turned in the direction of the filter, so that a generally used high external static pressure target model can achieve a fan efficiency increase of almost 10%. As a result, There is an effect that power consumption of the fan / air cleaning device can be reduced by about 5 to 10%. In addition, the high efficiency of this fan has reduced the thickness of the fan and air purifier,
Further, there is an effect of reducing noise by reducing the number of revolutions. Furthermore, the highly efficient fan allows the container to be thinner,
This has the effect of improving clean room construction costs and installation efficiency.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an air cleaning device according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line aa of FIG.

FIG. 3 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.

FIG. 4 is a sectional view taken along the line aa in FIG. 3;

FIG. 5 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.

FIG. 6 is a sectional view taken along the line aa of FIG. 5;

FIG. 7 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.

FIG. 8 is a sectional view taken along the line aa of FIG. 7;

FIG. 9 is a partial perspective view showing a flow state of the present invention.

FIG. 10 is a diagram showing fan performance, which shows the effect of the present invention.

FIG. 11 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.

FIG. 12 is a sectional view taken along the line aa in FIG. 11;

FIG. 13 is a bottom view of the air cleaning device according to the embodiment of the present invention.

FIG. 14 is a bottom view of the air purifying apparatus according to the embodiment of the present invention.

FIG. 15 is a sectional view taken along the line bb of FIG. 14;

FIG. 16 is a sectional view taken along the line cc in FIG. 13;

FIG. 17 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.

18 is a sectional view taken along the line aa in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Suction pipe, 3 ... Centrifugal fan, 4 ... Blade, 5 ... Motor, 6 ... Motor support member, 7 ... Tongue member, 8
... tongue tip, 9 ... baffle plate, 10 ... filter, 11
... Baffle plate, 12 ... Guide, 13 ... Drive system part, 14 ...
Auxiliary member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuji Toyama 46-1, Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture Inside the Industrial Machinery Division, Hitachi, Ltd. 1. Hitachi Techno Engineering Co., Ltd. Nakajo Office

Claims (9)

[Claims] 1. A container for changing a swirling flow of air flowing out of a centrifugal fan in a centrifugal direction into a direction parallel to an axis of a fan shaft of the centrifugal fan, and air provided with a filter for purifying air downstream of the container. An air purifying device, comprising: a tongue member provided from an inner surface side of the container toward an outer peripheral direction of the fan so as to stop a swirling flow flowing in a centrifugal direction of the centrifugal fan. 2. The air purifying apparatus according to claim 1, further comprising a motor supporting member for supporting a fan driving motor, wherein the tongue member faces the outer periphery of the fan between the motor supporting member and the inner surface of the container. An air purifying device, wherein the air purifying device is arranged from an inner surface of the container to an outer periphery of the fan. 3. The air purifying apparatus according to claim 2, wherein the motor support member is provided between the centrifugal fan and the filter, and has a size and a structure larger than the fan outer diameter when viewed from the fan axial direction. An air purifier characterized by the above. 4. The air purifying apparatus according to claim 1, wherein the motor support member has one or more cutouts formed in a part of the baffle plate, and a tongue member is provided in the cutout. And air purifier. 5. The air purifying apparatus according to claim 4, wherein one or a plurality of bent portions are provided on a part of the baffle plate, and the bent portions are located on the outer peripheral portion of the fan and serve as tongue members. An air purifier characterized in that a vacant part is formed in the direction of the filter by the method. 6. The air purifying apparatus according to claim 1, wherein the tongue member is installed obliquely with respect to the rotation axis of the fan. 7. The air purifying apparatus according to claim 1, wherein the tip of the tongue member close to the outer periphery of the fan is installed at a different distance from the outer diameter of the fan. 8. The air purifying apparatus according to claim 1, wherein the tongue member, the baffle plate, or both of them are reinforcing members for the container. 9. A container for changing a swirling flow of air flowing out of a centrifugal fan in a centrifugal direction to a direction parallel to the axis of a fan shaft of the centrifugal fan, and air downstream of the container provided with a filter for purifying air. In the cleaning device, a motor support structure in which a tongue member provided to stop a swirling flow flowing out of the centrifugal fan in a centrifugal direction, a centrifugal fan, a motor driving the centrifugal fan, and an air intake member are assembled. An air cleaning device, wherein a member is incorporated in a container.